SOUND ACTIVATED SWITCH
twovolt
Clap switch/voice activated switch designed around op-amp, flip-flop and popular 555 IC.
Switch is free from false triggering to turn on/off any appliance, you just have to clap twice.
The sound of clap received by microphone, microphone changes the sound wave in electrical
wave which is further amplify by op-amp. 555 timer IC act as monostable multivibrator
then flip flop changes the state of output relay on every two clap.
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Supply Input 12 VDC, 60 mA
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Onboard preset for sensitivity adjust
¦
Onboard LED for relay On/Off state
¦
Onboard electret condenser microphone
¦
Relay output rated 5A, 230 VAC
¦
Four mounting holes of 3.2 mm each
¦
PCB dimensions 89 mm x 37 mm
twovolt
SR. QTY.
C N1
2 PIN PBT C ONNEC TOR
2
1
C N2
3 PIN PBT C ONNEC TOR
3
3
C 1,C 3,C 5
10uF/50V OR 63V
4
4
C 2,C 4,C 6,C 8 0.1uF
5
1
C7
1uF/63V
6
1
D1
3MM LED
7
1
D2
1N4007
8
1
MK1
ELEC TRET C ONDENSER MIC ROPHONE
D2
9
1
PR1
100K PRESET
10
1
Q1
BC 547
11
1
RE1
12V RELAY
12
2
R1,R9
10K
13
2
R2,R10
4.7K
14
3
R3,R8,R11
100K
15
1
R4
22K
16
2
R5,R7
1K
17
1
R6
180K
18
1
U1
4013
19
1
U2
LM358
20
1
U3
NE555
21
1
SOC KET
14 PIN DIP IC SOC KET
22
2
SOC KET
8 PIN DIP IC SOC KET
+V
+
PR1 100K PRESET
SENSITIVITY ADJUST
TRG
Q
Q
2
D
Q
1
11
Q
CLK
13
D1
12
RED LED
9
R
S
14
R
S
GND
CLK
VDD
8
4
3
U1B
CD4013B
C8
0.1uF
Q1
BC547
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R10 4.7K
Author Rajkumar Sharma
RE1
12V RELAY
CN2
PBT3
10
8
2
R11
100K
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OUT
3
GND
C6
0.1uF
D
+
CV
R9
5
R5
1K
1
4
U2A
LM358
10K
R8
100K
MK1
MIC
1uF/63V
C7
+
C5
1
+
3
-
C4
0.1uF
U1A
CD4013B
4
6
7
R6
180K
R7 1K
2
R4
22K
U3
NE555
7 DSCHG
6 THR
VCC
RST
C3
10uF/50V
5
R3
100K
GND
10uF/50V
C2
0.1uF
8
R2
4.7K
R1 10K
C1
10uF/50V
DESC RIPTION
1
CN1
PBT2
+
REF.
1
1N4007
CN1 Connector : Supply Input 12 VDC
CN2 Connector : Relay Output
PR1 : Sensitivity Adjust
D1 : LED for Relay On/Off status
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0 7 0 0 5
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